Add Windows 11 Widget support for playback control

[Copilot]

Implements a Windows 11 Widget that displays current station and playback status with Play/Pause control, following the Windows App SDK widget provider pattern.

Implementation

Widget Provider (Widgets/TrdoWidgetProvider.cs)

• COM server (CLSID D5A5B8F2-9C3A-4E1B-8F7D-6A4C3B2E1D9F) implementing IWidgetProvider
• Manages widget lifecycle and delegates to RadioPlayerWidget instances

Widget UI (Widgets/RadioPlayerWidget.cs)

• Subscribes to PlayerViewModel.PropertyChanged for real-time updates
• Renders Adaptive Card showing station name, status, and Play/Pause button
• Handles toggle verb to control playback

COM Registration (Widgets/Helper/)

• WidgetProviderFactory: Creates widget provider instances via COM
• RegistrationManager: Handles COM class registration lifecycle

App Integration (App.xaml.cs)

// Register widget provider when launched as COM server
if (cmdLineArgs.Contains("-RegisterProcessAsComServer"))
{
    WinRT.ComWrappersSupport.InitializeComWrappers();
    _widgetRegistrationManager = RegistrationManager<TrdoWidgetProvider>.RegisterProvider();
    return;
}

Manifest (Package.appxmanifest)

• COM server extension: Launches app with -RegisterProcessAsComServer argument
• Widget provider extension: Declares Trdo_RadioPlayer_Widget with small/medium/large sizes

Widget UI

Adaptive Card template binds to:

• stationName: Current station or "No station selected"
• statusText: "Now Playing" / "Paused"
• buttonText: "▶ Play" / "⏸ Pause"

Updates automatically when user changes playback state or switches stations.

Files Added

• 10 new files (5 code, 1 template, 2 assets, 2 docs)
• 788 lines total

Note: Requires Windows 11 and MSIX packaging for testing. Implementation follows Microsoft's official widget sample.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add Windows Widget Support</issue_title>
<issue_description>https://learn.microsoft.com/en-us/windows/apps/develop/widgets/implement-widget-provider-cs</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add Windows Widget Support #30

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